diff options
| author | David Hildenbrand <david@redhat.com> | 2022-10-21 12:11:39 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-12-11 18:12:08 -0800 |
| commit | e07cda5f232fac4de0925d8a4c92e51e41fa2f6e (patch) | |
| tree | 1281575e1e5572a15e071208047ee07bb6be74f8 | |
| parent | 6cce3314b928b2db7d5f48171e18314226551c3f (diff) | |
| download | linux-e07cda5f232fac4de0925d8a4c92e51e41fa2f6e.tar.bz2 | |
mm/pagewalk: add walk_page_range_vma()
Let's add walk_page_range_vma(), which is similar to walk_page_vma(),
however, is only interested in a subset of the VMA range.
To be used in KSM code to stop using follow_page() next.
Link: https://lkml.kernel.org/r/20221021101141.84170-8-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | include/linux/pagewalk.h | 3 | ||||
| -rw-r--r-- | mm/pagewalk.c | 20 |
2 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/pagewalk.h b/include/linux/pagewalk.h index 37dc0208862d..959f52e5867d 100644 --- a/include/linux/pagewalk.h +++ b/include/linux/pagewalk.h @@ -101,6 +101,9 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start, unsigned long end, const struct mm_walk_ops *ops, pgd_t *pgd, void *private); +int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start, + unsigned long end, const struct mm_walk_ops *ops, + void *private); int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, void *private); int walk_page_mapping(struct address_space *mapping, pgoff_t first_index, diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 0a5d71aaf9c7..7f1c9b274906 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -517,6 +517,26 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start, return walk_pgd_range(start, end, &walk); } +int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start, + unsigned long end, const struct mm_walk_ops *ops, + void *private) +{ + struct mm_walk walk = { + .ops = ops, + .mm = vma->vm_mm, + .vma = vma, + .private = private, + }; + + if (start >= end || !walk.mm) + return -EINVAL; + if (start < vma->vm_start || end > vma->vm_end) + return -EINVAL; + + mmap_assert_locked(walk.mm); + return __walk_page_range(start, end, &walk); +} + int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, void *private) { |